Scrape-off-layer current loops and floating potential in limited tokamak plasmas

Loizu, J.; Morales, J. A.; Halpern, F. D.; Ricci, P.; Paruta, P.

doi:10.1017/s0022377817000927

Scrape-off-layer current loops and floating potential in limited tokamak plasmas

Journal Article · 01 December 2017 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/s0022377817000927· OSTI ID:1538929

Loizu, J.; Morales, J. A.; Halpern, F. D.; Ricci, P.; Paruta, P.

We investigate the question of how plasma currents circulate and close in the scrape-off-layer (SOL) of convection-limited tokamak plasmas. A simplified two-fluid model describes how currents must evacuate charge at the sheaths due to cross-field currents that are not divergence-free. These include turbulence-driven polarization currents and poloidally asymmetric equilibrium diamagnetic currents. The theory provides an estimate for the radial profile of the floating potential, which reveals a dipolar structure like the one observed experimentally. Simulations with a fluid turbulence code provide evidence for the predicted behaviour of currents and floating potential.

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-95ER54309

OSTI ID:: 1538929

Journal Information:: Journal of Plasma Physics, Vol. 83, Issue 6; ISSN 0022-3778

Publisher:: Cambridge University Press

Country of Publication:: United States

Language:: English

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